Endurance charge nodes question

Hello,

I've notice some builds have endurance charge nodes such as life regen and duration skipped and some are not. Could someone explain why they did it? and what might be optimal way?

bump

im a rookie, but i would guess that at their level they have their physical and elemental reductions maxxed without needing more charges. Currently I believe those values are 90 and 75% respectively.

I know at lvl 48 with 4 charges Im getting close.

As the first reply mentioned, people with very high damage reduction and resists may not need the extra endurance charges. Most of the bonuses to endurance charge bonuses such as health regen are on the other side of getting an extra endurance charge an may not be worth the extra point or two in some people's minds.